After a space rock struck Earth 66 million years ago — killing the dinosaurs — another asteroid hit, delaying Earth's recovery from a mass extinction.
  • Business Insider
  • Jun 19, 2021

Second space rock struck Earth after the one that killed the dinosaurs - Business Insider

About 66 million years ago, Earth took a one-two punch, according to a new study. First came a space rock 6-miles-wide that struck present-day Mexico. The impactor, named Chicxulub, contributed to t… [+3712 chars]

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A major challenge to harvesting fusion energy on Earth - Phys.org
  • Phys.Org
  • Aug 06, 2021

A key challenge for scientists striving to produce on Earth the fusion energy that powers the sun and stars is preventing what are called runaway electrons, particles unleashed in disrupted fusion experiments that can bore holes in tokamaks, the doughnut-shap…...